In storage technology, deduplication essentially refers to the elimination of
redundant data. In the deduplication process, duplicate data is deleted, leaving
only one copy of the data to be stored. However, indexing of all data is still
retained should that data ever be required. Deduplication is able to reduce the
required storage capacity since only the unique data is stored. Deduplication is
also also written as de-duplication, and is synonymous with data
reduction or commonality factoring.
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Webopedia's "Did You Know... Understanding Storage" The world of storage can be forbidding to a novice. Even veteran IT personnel may be put off by the sheer volume of new terminology and alphabet soup that has evolved.